Photographic-printing frame.



W. E. BOND.

PHOTOGRAPHIC PRINTING FRAME.

APPLICATION FILED Nov. so. 1915.

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WILLIAM EBENEZER BOND, OF COUNTY OF HERTFORD, ENG-LAND.

'.PHOTOGRAPHIC-PRINTING FRAME.

Specification of Letters Patent.

Patented Feb. 11, 1919.

Application led November 30, 1915. Serial No. 64,243.

To aZZ whom t may concern Be it known that I, WILLIAM EBENEZER BOND, asubject of the King of England, residing at county of Hertford, inEngland, have invented a certain new and useful Improvement inPhotographic Printing Frames, of which the following is a specification.g

This invention relates to photographic printing frames in which atwo-part removable back is carried b-y a frame wherein the negative isplaced and fastening devices are pivoted to the back and engage theframe or fittings thereon for the purpose of securing the back in placewhile permitting a p ortion thereof to be folded back for inspection ofthe print.

In printing frames of this kind as previously constructed the portion ofthe back` which is intended to remain secured while the=other portion isfolded back, has not hitherto been so rmly held as to prevent a possibleslight displacement whereby the print may be shifted and rendereduseless. The fastening devices have also been of such a nature thattheir manipulation has a tendency to shift the back and displace theprint.

The purpose of this invention is to provide improved means forovercoming these disadvantages.

Referring to the annexed drawings which illustrate a method of carryingthis invention into effects- `Figure 1 is an elevation of the rear of aphotographic printing frame fitted with my improvements. Figs. 2 and 3are cross sections on the lines 22 and 3-3 respectively of Fig. l.

A is the frame and B the removable back consisting of two portions B1and B2 hinged together.

According to the invention the portlon B2 of the back B which isintended to remain secured when the print is being inspected and is onlyintended to be unfastened when the paper is to be inserted in the frameor the print removed, is provided with a member such as the usual twoarmed leaf spring C centrally pivoted to the back at D and adapted toengage at its ends with the frame, as for example in grooves E in theinner faces of the side members of the frame; but instead of relying onthe frictional engagement of the ends of said member C for the purposeof holding this part of the back against movement, there is providedaccording to the invention for each end of the member a fastening ofsuch nature that the two fastenings, when engaged, hold the memberrigidly against rocking movement in the plane of the frame. Suchfastening may conveniently take the form of a snap fastening which mayembody a hole or depression F in the end of the member (one in each end)and a pin or projection Gr 0n the frame or vice versa, so that when theback is in place and the member C manipulated to engage, these snapfastenings may also engage and securely hold the member C andconsequently the portion B2 of the back to which the member is pivoted.

It will be understood that in order that this method of securing themember may be effective to prevent the back from shifting, thefastenings must be so placed that when engaged the back is firmlypressed against the end of the frame.

'Additional security is provided for by placing a compressible pad orpads, I-I for example of rubber or a suitable sprin or springs, againstthe lower end of the ra bet of the frame A, so that in order to engagethe snap fastening slome pressure will be needed of the back endwise inthe frame, compressing the pad 0r pads, and firmly bedding the end ofthe back against the pad or pads at the end of the frame.

In order to prevent the manipulation of the closing device on the otherportion B1 of the back from having such tendency to shift the back as isfound with a single leaf spring pivoted to this part of the back, owingprincipally to the comparatively large twisting leverage which isexerted by the spring when it is being turned on its pivot and isfrictionally moving in the grooves or fastening members of the frame,the single leaf spring on this part of the back is replaced by twoseparate springs J J1 which may be pivoted on a common center or onseparate centers on the back as illustrated and are intended to bemanipulated at the same time in opposite rotary directions, so that anyfrictional resistance to their engagement is in the same direction asregards the frame and is withstood by the aforesaid snap fastenings andpads equally on both sides of the frame.

The portion B2 of the back which is intended to remain secured while theprint is being inspected is also preferably made somewhat wider than theother portion, (that is to say in the direction parallel to the'line ofthe hinges K K1) so that the portion B1 being not so wide is not liableto contact withthe edges of the frame when it is being manipulated, aspace BX being left between it and the frame.

I havealso found it convenient to so attach the hinges K K1 by whichthetwoparts Bl B2 of the back are secured to one another that the axisof these'hinges is not in the meetingplane of the edges of the two partsB1 B2 but is displaced toward the lower end of back as shown in Fig. l.This obviates any scraping action of the lower inside edge of the partB1 against the back of the print when the.` part B1 is folded into theframe after the inspection of the print.

I havefound that it is convenient, especially inthe smaller sizes offrames, to bevel the side edges of the portion B2, as shown at B4 in Fig. 3. This wvill enable the middle part of the saidportion B2 to bemade relatively thiclrer, or the depth ofthe side members of the frame Ato be less and yet allow.

the ends of the member C to easily engage the grooves E.

What I claim as my invention and desire to secure by Letters Patent of'the United States is 1. In a photographic printing frame thecombination yof lan exterior frame having grooves in the inner faces ofits side members, a two-part hinged back, a two-armed member pivoted onone part of the back and adapted to engage the said grooves, andadditional engaging means carried by said frame adapted to hold thetwo-armed member when engaged in the grooves rigid against rockingmovement in the plane of the frame. A

2. In a photographic printing frame the combination'of an exterior framehaving groovesin the inner faces of its side members, a two-part hingedback, a two-armed member pivoted on one part of the back, and adapted toengage the said grooves, and additional engaging means carried by saidframe adapted to hold the two-armed member when engaged in the groovesrigid against sliding movement in the grooves, said additional engagingmeans being so located as to tend to force the back firmly against oneend of the frame.

3. In a photographic printing frame the combination of an exterior framehaving grooves in the inner faces of its side members, a two-part hingedback, a two-armed spring member pivoted on one part of the back, andadapted to engage the said grooves, and snap fastening means in saidgrooves adapted to hold the two-armed member when engaged therewithrigid Vagainst rocking movement in the plane of the frame.

4. In a photographic printing frame, the

combination of an exterior frame-having grooves in the inner faces ofits side members and engaging members in said grooves, a .back panelinsertible in said frame, and a two-armed member pivoted on said paneland having its extremities adapted to abut against and form snapengagement with said engaging members.

5. In a photographic printing frame the combination of a'two-part hingedback, a two-armed member pivoted on one part of theA back, an exteriorvframe, engagingr means carried by said frame'adapted to hold thetwo-armed member when engaged rigid against rocking'movement in theplane of the frame, and compressible pads in the frame against which thesaid part of the back is adapted to be pressed by the engagement of themember engaging means.

6. In a photographic printing frame, the combination, with an exteriorframe; of a removable.back,` comprising a part normally in fixedposition, and a movable part hinged to the xe'd part and adapted to bemanipulated for inspection of the print; the fixed part having a closefit in the frame, and the movable part being of less width than saidfixed part and arranged with its lateral edges spaced from those of saidframe, thereby to prevent accidental shifting of said back, and contactbetween the adjacent lateral edges ofsaid movable part and said frame,during manipulation ofy the movable part. i 4

7 In a photographic printing frame, the combination, with an exteriorframe; of fa back comprising a part normally in fixed position, amovable part adapted to Vbe manipulated for inspection of the print, andhinges connecting said parts; the knuckles of the hinges beingsunk inthe fixed part so as to displace the axes of said hinges from themeeting plane of the two parts, thereby to prevent the movable part fromexerting a scraping action on the print.

8. In aphotographic printing frame the combination of a two-part hingedback, a two-armed member pivoted on one part of the back, an exteriorframe, engaging means carried by said frame adapted to hold thetwo-armed member when engaged rigid against rocking movement in theplane of the frame, and two separate retaining fingers pivoted on theother part of the back adapted to engage retaining means on the frame byswinging movement in opposite directions.

9. A photographic printing frame comprising a two-part hinged backhaving pivoted on that portion of the back which is intended to bemanipulated for inspection of thelprint two retaining fingers adapted tobe swung about their pivots in opposite directions to one anothersubstantially as and for the purpose set forth.

10. A photographic printing frame, oo1nprising a two-part hinged backhaving on that portion of the back which is intended to be manipulatedfor inspection of the print two separate retaining fingers pivotedrespeetively on two pivots in a line transversely of the back andadapted to be swung about their pivots.

l1. In a photographic printing frame, the combination, with an exteriorrabbeted frame; of a removable back, Comprising two members hingedtogether and having dierent widths, the narrower member having its edgesdisposed in spaced relation to the rabbets of the frame; and means forholding the wider member immovable in said frame. In witness whereof Ihave signed this specification in the presence of two witnesses.

WILLIAM EBENEZER BOND. Witnesses:

R. I-IADDAN, A. E. HATHAWAY.

Copies of this patent may be obtained foi` ve cents each, by addressingthe Commissioner of Patents, Washington, D. G.

